Fire-alarm box.



E. L. ROWLEY & G. H. GIBSON.

FIRE ALARM BOX.

APPLICATION FILED MAR. 5, 1914.

Patented Nov. 17, 1914.

2 SHEETS-SHEET 1,

gvwewtow THE NORRIS PETERS CO" PHOTIPLITHQ, WASHINGTON. D. C

E. L. ROWLEY & G. H. GIBSON.

FIRE ALARM BOX.

APPLICATION FILED MAR. 5, 1914.

1 1 17,706. Patented Nov. 17, 1914.

2 SHEETS-SHEET 2.

THE NORRIS PETERS c0. PHOTO LlrHa, WASHING ION D Cv N 1E fiTATES PATENT @FFFUE.

ERVIN L. ROiVLEY AND GEORGE H. GIBSON, OF DETROIT, MICHIGAN.

FIRE-ALARM BOX.

To all whom it may concern Be it known that we, ERvIN L. RowLnY and Gnonon H. GIBSON, citizens of the United States, residing at Detroit, in the county of lVayne and State of Michigan, have invented certain new and useful Improvements in Fire-Alarm Boxes, of which the following is a specification.

Our invention relates to improvements in fire alarm boxes, and the leading object is the provision of means which will prevent the ringing of false alarms or tampering with the boxes by unauthorized persons, by holding the person who improperly sounds an alarm and thus permitting the capture of said person.

Another object of our invention is the provision of means for general use which will add little to the expense of the box, which will absolutely trap and hold the person sounding an alarm, which will be simple, strong and durable in construction, and which in every particular will be absolutely eflicient and practical.

With these objects in view, our invention consists of a fire alarm box embodying novel features of construction and combination of parts substantially as shown, described and claimed.

In order that the construction in detail and the operation of our invention may be understood and its many advantages be fully appreciated, we have illustrated in the accompanying drawing a fire alarm box equipped with our improvements.

Figure 1 represents a front elevation of the fire alarm box with the outer door open and the inner door closed and locked. Fig. 2 represents an elevation of a portion of the box and a view of the inner door looking at the rear side and disclosing the mechanism which constitutes our invention. Fig. 3 is a sectional view on the line 3-3 of Fig. 2, and Fig. 1 represents an elevation looking at the rear of the inner door showing the mechanism forming my invention, the parts being in the position they occupy when the locking arms are closed to engage and hold the arm of the person.

Referring by numeral to the drawing, in which similar characters of reference denote corresponding parts in all of the views: The numeral 1 designates the fire box, which is of the usual or any desired construction, being provided with the outer hinged door 2, and the inner hinged door 3, the latter Specification of Letters Patent.

Application filed March 5, 1914.

Patented Nov. 17, 1914:. Serial No. 822,548.

having a lock 1, a sight opening 5, and a hand receiving opening 6, the latter permitting the insertion of the hand in pulling the alarm.

The mechanism which constitutes our invention is located or mounted upon the rear of the hinged door 3, and is of extremely simple construction, consisting of the pair of weight guides 7, having channels 8, to receive the reduced ends 8, of the operating weight 9, which is formed with a slot or recess 10, to receive the depending portions 11, on the pair of pivoted locking arms or levers 12. Those looking arms or levers are pivoted at 13 and are of curved shape and located immediately in rear of the hand receiving opening 6, of the door, and are further provided near their upper edge with recesses 14, which when the levers are in open position, as shown in Fig. 2, form a keeper to receive the locking bolt 15. This locking bolt is guided in a bracket 16, and a strip or block 17, and at its upper end is provided with an extension 18, adapted to be engaged by one end of the trip lever 19, pivoted upon the bracket 20, and operated by the depending hand cord or connection 21. which trips the lever, moves the sliding locking bolt and permits the locking arms or levers to close.

In normal position the locking arms are in the position shown in Fig. 2, being retained open by the locking bolt, and upon the pulling of the hand cord, the locking bolt is raised and releases the locking arms or levers, which through the medium of the vertically movable operating weight 9, through its weighted cords 25 and 26, carrying at their free ends the weights 25 and 26', guided by the lower pair of rollers 27, upper single roller 28, and pair of guide rollers 29, causes said weight 9 to fall and draw the lower extensions on the locking arms inward, closing the said locking arms and firmly trapping the arm of the person and preventing the withdrawal of the arm until the arrival of the proper person.

It will be observed that the instant a person inserts his hand and pulls upon the hand connection the trip lever moves the locking bolt, releasing the locking arms or levers, which instantly close tight upon the hand and hold the person and enable the arrest of said person, thus preventing the sounding of false alarms. It will also be noted that the mechanism is of extremely simple construction and dispenses With springs or other devices of llke character, thus insuring durability and reliabillty 1n operation, as Well as cheapness of production.

\Ve claim:

1. A lire-alarm box, consisting of the box proper, having the outer and inner hinged door, the latter being provided With a hand and sight opening, a trip lever mounted in thebox, a sliding bolt operated by said lever, locking levers having their upper end disengaged and released by said sliding bolt to engage and retain the arm of the person, a Weight engaging the. other ends of said levers, and Weighted cords for operating said Weight.

2. A fire alarm box, consisting of the box, the hinged door having a hand opening, a pair of locking levers pivoted in rear of said opening upon said door and formed With extensions, a Weight engaging said extensions for closing said locking levers, cords connected with said weight, welghts for operating said cords, a locking bolt for retain- 25 ing the locking levers in open position, and means for operating said locking bolt.

3. A fire alarm box, consisting of the box, the hinged door having a hand opening, a

pair of pivoted locking levers formed at 30 their upper portions With recesses and having lower extensions, a locking bolt engaging said recesses to retain the levers open, a sliding weight engaging the extensions of the levers for closing said levers, Weighted 35 Copies of this patent may be obtained or five cents each, by ad essing the "Commissioner of Patents,

Washington, D. G. 

